WEB EXCLUSIVE: New long-fiber thermoplastic (LFT) compounds from PlastiComp, LLC, Winona, Minn., are said to beat previous alternatives with a combination of high-level EMI shielding performance with cost-effectiveness and thin-wall moldability. Up to now, the company says, carbon fibers—even with nickel coating—typically provide shielding in the 30 to 40 dB range. Moreover, the carbon fibers reportedly lose mechanical properties and their shielding properties drop precipitously in thin-wall parts. Specialized nickel-coated carbon fibers or secondary operations with conductive paints are also said to be cost-prohibitive.
PlastiComp says it overcame these limitations with a long-carbon-fiber nylon compound containing proprietary additives that was developed for a particular customer and application. Reqirements included stiffness of 35 GPa (5.075 million psi), shielding of 50 dB or better, and surface resistivity of 5 ohm/sq or less. All this in a part with wall thickness of 1.5 mm or less. PlastiComp used structural and mold-filling analyses were used to ensure retention of fiber lengths sufficient to form a network of reinforcing fibers. Its solution reportedly tested out at 50 to 70 dB shielding effectiveness and met the customer’s cost restrictions as well.
(507) 452-5642 • plasticomp.com
25 McConnon Dr. Winona, MN 55987
Phone (507) 454-4334 Fax (507) 452-5642